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Difference between kleene star and a plus

  1. Oct 25, 2014 #1
    1. The problem statement, all variables and given/known data
    So this isn't a question from a homework directly, but it's been used in my text book an I'm not sure of the difference. For example, if I have a* and a+, what is the difference

    2. Relevant equations
    The exact wording in the book was {0,1}* and {0,1}+

    3. The attempt at a solution
    I know the kleene star means you have 0 or more repetitions of that symbol, i.e. 0* = n occurrences of 0 where n ≥ 0. I'm not sure what the plus means at all
     
  2. jcsd
  3. Oct 25, 2014 #2

    haruspex

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